package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {


    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;

    /**
     * 根据id删除 删除之前需要判断
     * @param id
     */
    @Override
    public void remove(Long id) {
        //添加查询条件,根据分类id进行查询菜品数据
        LambdaQueryWrapper<Dish> lqwDish=new LambdaQueryWrapper<>();
        lqwDish.eq(Dish::getCategoryId,id);
        int dishCount = dishService.count(lqwDish);
        //如果已经关联 抛出一个业务异常
        if (dishCount>0){
            throw new CustomException("当下分类关联了菜品,不能删除");
        }

        //添加查询条件,根据分类id查询套餐数据
        LambdaQueryWrapper<Setmeal> lqwSetmeal=new LambdaQueryWrapper<>();
        lqwSetmeal.eq(Setmeal::getCategoryId,id);
        int setmealCount = setmealService.count(lqwSetmeal);

        if (setmealCount>0){
            throw new CustomException("当下分类关联了套餐,不能删除");
        }

        //删除id
        removeById(id);
    }
}
